erc:
who: United States. Bureau of the Census.
what: 2000 Census County Block Map: Collin County, Block 16
when: 2000
where: https://texashistory.unt.edu/ark:/67531/metapth370415/
erc-support:
who: University of North Texas Libraries
what: Permanent: Stable Content:
when: 20081203
where: https://texashistory.unt.edu/ark:/67531/